Abstract
Single ion chromatograms obtained by GC/MS analysis were successfuly used for compositional analysis of lignin-derived and coal-derived liquids after correcting the sensitivity for a specific ion of each component.
Kraft lignin and seven coals were individually liquefied at 450C for 1 hour in tetralin under an initial hydrogen pressure of 9.8 MPa. The hexane soluble products containing alkylbenzenes as internal standard were injected into GC/MS, and Naphthalenes (m/z 156, 170), acenaphthenes (m/z 168, 182), and indanols (m/z 134, 148) were determined by comparing the peak area in their single ion chromatograms with those of internal standard and correcting their sensitivities. The distribution of naphthalenes, acenaphthenes, indanols and phenols were similar for lignin-derived and seven coal-derived oils. Polycondenced aromatic structures in lignin-derived oil should be formed during a pulping process and/or liquefaction, and the structual change from monoaromatics in lignin to polycondenced rings in the product oil seemed to be similar to that in coalification process. Lignin-like structures composed of monoaromatic rings still existed in bituminous coals.
